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4 Sisters, Newlyweds and Young Parents Among 20 Killed in New York Limo Crash

As investigators piece together what caused the limo crash that killed 20 people in upstate New York, more details are coming out about the 17 passengers, who had gotten together to celebrate a birthday.

Authorities have not released all of the victims' names, but the close-knit group included newlyweds, artists, athletes and young parents. Four were sisters.

The limo failed inspection. And the driver wasn't properly licensed.

"Everyone's lives were cut way too short, and I don't know what to say about it. It just hurts," Karina Halse told CNN on Monday while visiting the scene of the accident where her older sister, Amanda Halse, was killed.

Here's what we know about the victims:

Amanda Halse and Patrick Cushing

Amanda Halse was an artist. Karina Halse called her the peacekeeper in the family.

"My big sister was so great and she was so wonderful. She was such a spontaneous person and she did whatever she could to have fun with anyone and everyone around her," Karina Halse said.

They had gotten together last weekend to make a day trip to Vermont with their mom.

"It was just a nice get-together for all three of us girls to have a nice day out," Karina Halse said. "It was a nice sendoff, I guess, because that would be the last time I would ever see her in person."

Patrick Cushing, Halse's boyfriend, was also killed in the crash.

Cushing worked in the New York State Senate's Technology Service unit and played for the US Dodgeball team, which described him on Facebook as an amazing friend and "one of the most agile and dominant players in the world."

Justin Cushing said his brother was passionate and goodhearted.

"He had such empathy and kindness. He loved, hugged, and cried with his friends and family like their problems were his, and celebrated with those same family and friends like our successes were his personal goals," he said.

Shane McGowan and Erin Vertucci McGowan

Shane and Erin McGowan married in June, and her aunt said they were "two of the sweetest souls you could ever meet."

"They were both just soul mates because they just radiated love and beauty and how a marriage should be," Valerie Abeling told CNN. "They were just loving and funny and kind and everybody loved them and they were so good together. Their lives were just cut short too soon."

Amy and Axel Steenburg

Newlyweds Amy and Axel Steenburg also married in June. In her last public Facebook post, she gushed about her husband.

"I just wanted to say Axel Steenburg I love you more than words can say! You are such an amazing man and entertain all my crazy ideas. Even when I move a couch just to move it back to the original place. Thank you for being so kind and loving xo #justbecause #husband," she wrote.

State Assemblyman Angelo Santabarbara confirmed that Amy Steenburg's sisters Abby Jackson, Mary Dyson, and Allison King were also killed in the crash.

Abby and Adam Jackson

Abby and Adam Jackson were parents to two young children. "Adam and Abby were amazing parents to these girls and taken much too soon," Sarah Maltzman, a family friend wrote on a GoFundMepage set up to pay for college and expenses for the couple's daughters.

Abby Jackson worked as a middle school special education teacher in Amsterdam, New York, according to Santabarbara.

Rob and Mary Dyson

Mary Dyson was a coach at a Crossfit gym in Watertown, New York. The gym held a special workout in her honor on Monday.

"She will be cheering us on and laughing at some of us!!" organizers wrote in a post on the gym's Facebook page.

Her husband Rob was also killed.